I am not knocking the a9. Far from it.
I just think to claim it as the "ultimate camera" before anyone has one in hand to be a bit disingenuous. I hope that it is a wonder, especially given its price!
I am concerned about the "rolling shutter" issues as I have yet to see evidence that it is not present. It may be lessened, but eliminated is a stretch - though I am willing to be convinced.
As far as AF, let's see some real-world tests before going off.
OIS is still better than the 5-axis system in the Sony. Even Sony admits this and turns off much of the 5-axis once an OIS lens is attached.
One thing is I don't care FF vs. APS. It is all in the ISO, AF, etc. No one looks at my prints and remarks on the size of the sensor. Can you tell?
Better battery life is always good. $3,000 good? Maybe not.
My point was not about the a9, but about the superlatives and brand idolatry that has pervaded the industry. I would like to see some real-world testing and comparison of the camera systems. I do not care for BS adjectives and support for certain brands regardless. I have used Sony cams. Personally, I do not like the handling, though the images are fine.
Let's wait before crowning a "King of Cameras". Ok?